apk-fetch fails when cdrom repo is present

ran into some funky behavior when downloading packages while running from alpine-virt-3.15.0-x86_64.iso:

sed -ri 's/"1fhr"/"c1fhr"/' /sbin/setup-apkrepos  # bugfix community-repo flag
setup-interfaces -ar
setup-apkrepos -1c
apk update
apk fetch -R eudev

this fails with the following error:

ERROR: unable to select packages:
  /bin/sh (virtual):
    provided by: busybox
    required by: eudev-3.2.11_pre1-r0[/bin/sh]
                 udev-init-scripts-35-r0[/bin/sh]

however if you remove the cdrom repo, it works:

sed -ri /cdrom/d /etc/apk/repositories
apk fetch -R eudev

# Downloading libblkid-2.37.3-r0
# Downloading eudev-libs-3.2.11_pre1-r0

I noticed that apk add works alright, just not apk fetch. Bug?